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  <h1>Source code for torchvision.datasets.imagenet</h1><div class="highlight"><pre>
<span></span><span class="kn">import</span> <span class="nn">warnings</span>
<span class="kn">from</span> <span class="nn">contextlib</span> <span class="kn">import</span> <span class="n">contextmanager</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">shutil</span>
<span class="kn">import</span> <span class="nn">tempfile</span>
<span class="kn">import</span> <span class="nn">torch</span>
<span class="kn">from</span> <span class="nn">.folder</span> <span class="kn">import</span> <span class="n">ImageFolder</span>
<span class="kn">from</span> <span class="nn">.utils</span> <span class="kn">import</span> <span class="n">check_integrity</span><span class="p">,</span> <span class="n">extract_archive</span><span class="p">,</span> <span class="n">verify_str_arg</span>

<span class="n">ARCHIVE_META</span> <span class="o">=</span> <span class="p">{</span>
    <span class="s1">&#39;train&#39;</span><span class="p">:</span> <span class="p">(</span><span class="s1">&#39;ILSVRC2012_img_train.tar&#39;</span><span class="p">,</span> <span class="s1">&#39;1d675b47d978889d74fa0da5fadfb00e&#39;</span><span class="p">),</span>
    <span class="s1">&#39;val&#39;</span><span class="p">:</span> <span class="p">(</span><span class="s1">&#39;ILSVRC2012_img_val.tar&#39;</span><span class="p">,</span> <span class="s1">&#39;29b22e2961454d5413ddabcf34fc5622&#39;</span><span class="p">),</span>
    <span class="s1">&#39;devkit&#39;</span><span class="p">:</span> <span class="p">(</span><span class="s1">&#39;ILSVRC2012_devkit_t12.tar.gz&#39;</span><span class="p">,</span> <span class="s1">&#39;fa75699e90414af021442c21a62c3abf&#39;</span><span class="p">)</span>
<span class="p">}</span>

<span class="n">META_FILE</span> <span class="o">=</span> <span class="s2">&quot;meta.bin&quot;</span>


<div class="viewcode-block" id="ImageNet"><a class="viewcode-back" href="../../../datasets.html#torchvision.datasets.ImageNet">[docs]</a><span class="k">class</span> <span class="nc">ImageNet</span><span class="p">(</span><span class="n">ImageFolder</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;`ImageNet &lt;http://image-net.org/&gt;`_ 2012 Classification Dataset.</span>

<span class="sd">    Args:</span>
<span class="sd">        root (string): Root directory of the ImageNet Dataset.</span>
<span class="sd">        split (string, optional): The dataset split, supports ``train``, or ``val``.</span>
<span class="sd">        transform (callable, optional): A function/transform that  takes in an PIL image</span>
<span class="sd">            and returns a transformed version. E.g, ``transforms.RandomCrop``</span>
<span class="sd">        target_transform (callable, optional): A function/transform that takes in the</span>
<span class="sd">            target and transforms it.</span>
<span class="sd">        loader (callable, optional): A function to load an image given its path.</span>

<span class="sd">     Attributes:</span>
<span class="sd">        classes (list): List of the class name tuples.</span>
<span class="sd">        class_to_idx (dict): Dict with items (class_name, class_index).</span>
<span class="sd">        wnids (list): List of the WordNet IDs.</span>
<span class="sd">        wnid_to_idx (dict): Dict with items (wordnet_id, class_index).</span>
<span class="sd">        imgs (list): List of (image path, class_index) tuples</span>
<span class="sd">        targets (list): The class_index value for each image in the dataset</span>
<span class="sd">    &quot;&quot;&quot;</span>

    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">root</span><span class="p">,</span> <span class="n">split</span><span class="o">=</span><span class="s1">&#39;train&#39;</span><span class="p">,</span> <span class="n">download</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
        <span class="k">if</span> <span class="n">download</span> <span class="ow">is</span> <span class="kc">True</span><span class="p">:</span>
            <span class="n">msg</span> <span class="o">=</span> <span class="p">(</span><span class="s2">&quot;The dataset is no longer publicly accessible. You need to &quot;</span>
                   <span class="s2">&quot;download the archives externally and place them in the root &quot;</span>
                   <span class="s2">&quot;directory.&quot;</span><span class="p">)</span>
            <span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="n">msg</span><span class="p">)</span>
        <span class="k">elif</span> <span class="n">download</span> <span class="ow">is</span> <span class="kc">False</span><span class="p">:</span>
            <span class="n">msg</span> <span class="o">=</span> <span class="p">(</span><span class="s2">&quot;The use of the download flag is deprecated, since the dataset &quot;</span>
                   <span class="s2">&quot;is no longer publicly accessible.&quot;</span><span class="p">)</span>
            <span class="n">warnings</span><span class="o">.</span><span class="n">warn</span><span class="p">(</span><span class="n">msg</span><span class="p">,</span> <span class="ne">RuntimeWarning</span><span class="p">)</span>

        <span class="n">root</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">expanduser</span><span class="p">(</span><span class="n">root</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">split</span> <span class="o">=</span> <span class="n">verify_str_arg</span><span class="p">(</span><span class="n">split</span><span class="p">,</span> <span class="s2">&quot;split&quot;</span><span class="p">,</span> <span class="p">(</span><span class="s2">&quot;train&quot;</span><span class="p">,</span> <span class="s2">&quot;val&quot;</span><span class="p">))</span>

        <span class="bp">self</span><span class="o">.</span><span class="n">parse_archives</span><span class="p">()</span>
        <span class="n">wnid_to_classes</span> <span class="o">=</span> <span class="n">load_meta_file</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span>

        <span class="nb">super</span><span class="p">(</span><span class="n">ImageNet</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">split_folder</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">=</span> <span class="n">root</span>

        <span class="bp">self</span><span class="o">.</span><span class="n">wnids</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">classes</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">wnid_to_idx</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">class_to_idx</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">classes</span> <span class="o">=</span> <span class="p">[</span><span class="n">wnid_to_classes</span><span class="p">[</span><span class="n">wnid</span><span class="p">]</span> <span class="k">for</span> <span class="n">wnid</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">wnids</span><span class="p">]</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">class_to_idx</span> <span class="o">=</span> <span class="p">{</span><span class="bp">cls</span><span class="p">:</span> <span class="n">idx</span>
                             <span class="k">for</span> <span class="n">idx</span><span class="p">,</span> <span class="n">clss</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">classes</span><span class="p">)</span>
                             <span class="k">for</span> <span class="bp">cls</span> <span class="ow">in</span> <span class="n">clss</span><span class="p">}</span>

    <span class="k">def</span> <span class="nf">parse_archives</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">if</span> <span class="ow">not</span> <span class="n">check_integrity</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">,</span> <span class="n">META_FILE</span><span class="p">)):</span>
            <span class="n">parse_devkit_archive</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">)</span>

        <span class="k">if</span> <span class="ow">not</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isdir</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">split_folder</span><span class="p">):</span>
            <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">split</span> <span class="o">==</span> <span class="s1">&#39;train&#39;</span><span class="p">:</span>
                <span class="n">parse_train_archive</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">)</span>
            <span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">split</span> <span class="o">==</span> <span class="s1">&#39;val&#39;</span><span class="p">:</span>
                <span class="n">parse_val_archive</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">)</span>

    <span class="nd">@property</span>
    <span class="k">def</span> <span class="nf">split_folder</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">split</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">extra_repr</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="s2">&quot;Split: </span><span class="si">{split}</span><span class="s2">&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="o">**</span><span class="bp">self</span><span class="o">.</span><span class="vm">__dict__</span><span class="p">)</span></div>


<span class="k">def</span> <span class="nf">load_meta_file</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">file</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
    <span class="k">if</span> <span class="n">file</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
        <span class="n">file</span> <span class="o">=</span> <span class="n">META_FILE</span>
    <span class="n">file</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">file</span><span class="p">)</span>

    <span class="k">if</span> <span class="n">check_integrity</span><span class="p">(</span><span class="n">file</span><span class="p">):</span>
        <span class="k">return</span> <span class="n">torch</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">file</span><span class="p">)</span>
    <span class="k">else</span><span class="p">:</span>
        <span class="n">msg</span> <span class="o">=</span> <span class="p">(</span><span class="s2">&quot;The meta file </span><span class="si">{}</span><span class="s2"> is not present in the root directory or is corrupted. &quot;</span>
               <span class="s2">&quot;This file is automatically created by the ImageNet dataset.&quot;</span><span class="p">)</span>
        <span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="n">msg</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">file</span><span class="p">,</span> <span class="n">root</span><span class="p">))</span>


<span class="k">def</span> <span class="nf">_verify_archive</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">file</span><span class="p">,</span> <span class="n">md5</span><span class="p">):</span>
    <span class="k">if</span> <span class="ow">not</span> <span class="n">check_integrity</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">file</span><span class="p">),</span> <span class="n">md5</span><span class="p">):</span>
        <span class="n">msg</span> <span class="o">=</span> <span class="p">(</span><span class="s2">&quot;The archive </span><span class="si">{}</span><span class="s2"> is not present in the root directory or is corrupted. &quot;</span>
               <span class="s2">&quot;You need to download it externally and place it in </span><span class="si">{}</span><span class="s2">.&quot;</span><span class="p">)</span>
        <span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="n">msg</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">file</span><span class="p">,</span> <span class="n">root</span><span class="p">))</span>


<span class="k">def</span> <span class="nf">parse_devkit_archive</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">file</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Parse the devkit archive of the ImageNet2012 classification dataset and save</span>
<span class="sd">    the meta information in a binary file.</span>

<span class="sd">    Args:</span>
<span class="sd">        root (str): Root directory containing the devkit archive</span>
<span class="sd">        file (str, optional): Name of devkit archive. Defaults to</span>
<span class="sd">            &#39;ILSVRC2012_devkit_t12.tar.gz&#39;</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="kn">import</span> <span class="nn">scipy.io</span> <span class="k">as</span> <span class="nn">sio</span>

    <span class="k">def</span> <span class="nf">parse_meta_mat</span><span class="p">(</span><span class="n">devkit_root</span><span class="p">):</span>
        <span class="n">metafile</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">devkit_root</span><span class="p">,</span> <span class="s2">&quot;data&quot;</span><span class="p">,</span> <span class="s2">&quot;meta.mat&quot;</span><span class="p">)</span>
        <span class="n">meta</span> <span class="o">=</span> <span class="n">sio</span><span class="o">.</span><span class="n">loadmat</span><span class="p">(</span><span class="n">metafile</span><span class="p">,</span> <span class="n">squeeze_me</span><span class="o">=</span><span class="kc">True</span><span class="p">)[</span><span class="s1">&#39;synsets&#39;</span><span class="p">]</span>
        <span class="n">nums_children</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="nb">zip</span><span class="p">(</span><span class="o">*</span><span class="n">meta</span><span class="p">))[</span><span class="mi">4</span><span class="p">]</span>
        <span class="n">meta</span> <span class="o">=</span> <span class="p">[</span><span class="n">meta</span><span class="p">[</span><span class="n">idx</span><span class="p">]</span> <span class="k">for</span> <span class="n">idx</span><span class="p">,</span> <span class="n">num_children</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">nums_children</span><span class="p">)</span>
                <span class="k">if</span> <span class="n">num_children</span> <span class="o">==</span> <span class="mi">0</span><span class="p">]</span>
        <span class="n">idcs</span><span class="p">,</span> <span class="n">wnids</span><span class="p">,</span> <span class="n">classes</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="nb">zip</span><span class="p">(</span><span class="o">*</span><span class="n">meta</span><span class="p">))[:</span><span class="mi">3</span><span class="p">]</span>
        <span class="n">classes</span> <span class="o">=</span> <span class="p">[</span><span class="nb">tuple</span><span class="p">(</span><span class="n">clss</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">&#39;, &#39;</span><span class="p">))</span> <span class="k">for</span> <span class="n">clss</span> <span class="ow">in</span> <span class="n">classes</span><span class="p">]</span>
        <span class="n">idx_to_wnid</span> <span class="o">=</span> <span class="p">{</span><span class="n">idx</span><span class="p">:</span> <span class="n">wnid</span> <span class="k">for</span> <span class="n">idx</span><span class="p">,</span> <span class="n">wnid</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">idcs</span><span class="p">,</span> <span class="n">wnids</span><span class="p">)}</span>
        <span class="n">wnid_to_classes</span> <span class="o">=</span> <span class="p">{</span><span class="n">wnid</span><span class="p">:</span> <span class="n">clss</span> <span class="k">for</span> <span class="n">wnid</span><span class="p">,</span> <span class="n">clss</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">wnids</span><span class="p">,</span> <span class="n">classes</span><span class="p">)}</span>
        <span class="k">return</span> <span class="n">idx_to_wnid</span><span class="p">,</span> <span class="n">wnid_to_classes</span>

    <span class="k">def</span> <span class="nf">parse_val_groundtruth_txt</span><span class="p">(</span><span class="n">devkit_root</span><span class="p">):</span>
        <span class="n">file</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">devkit_root</span><span class="p">,</span> <span class="s2">&quot;data&quot;</span><span class="p">,</span>
                            <span class="s2">&quot;ILSVRC2012_validation_ground_truth.txt&quot;</span><span class="p">)</span>
        <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">file</span><span class="p">,</span> <span class="s1">&#39;r&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">txtfh</span><span class="p">:</span>
            <span class="n">val_idcs</span> <span class="o">=</span> <span class="n">txtfh</span><span class="o">.</span><span class="n">readlines</span><span class="p">()</span>
        <span class="k">return</span> <span class="p">[</span><span class="nb">int</span><span class="p">(</span><span class="n">val_idx</span><span class="p">)</span> <span class="k">for</span> <span class="n">val_idx</span> <span class="ow">in</span> <span class="n">val_idcs</span><span class="p">]</span>

    <span class="nd">@contextmanager</span>
    <span class="k">def</span> <span class="nf">get_tmp_dir</span><span class="p">():</span>
        <span class="n">tmp_dir</span> <span class="o">=</span> <span class="n">tempfile</span><span class="o">.</span><span class="n">mkdtemp</span><span class="p">()</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="k">yield</span> <span class="n">tmp_dir</span>
        <span class="k">finally</span><span class="p">:</span>
            <span class="n">shutil</span><span class="o">.</span><span class="n">rmtree</span><span class="p">(</span><span class="n">tmp_dir</span><span class="p">)</span>

    <span class="n">archive_meta</span> <span class="o">=</span> <span class="n">ARCHIVE_META</span><span class="p">[</span><span class="s2">&quot;devkit&quot;</span><span class="p">]</span>
    <span class="k">if</span> <span class="n">file</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
        <span class="n">file</span> <span class="o">=</span> <span class="n">archive_meta</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
    <span class="n">md5</span> <span class="o">=</span> <span class="n">archive_meta</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>

    <span class="n">_verify_archive</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">file</span><span class="p">,</span> <span class="n">md5</span><span class="p">)</span>

    <span class="k">with</span> <span class="n">get_tmp_dir</span><span class="p">()</span> <span class="k">as</span> <span class="n">tmp_dir</span><span class="p">:</span>
        <span class="n">extract_archive</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">file</span><span class="p">),</span> <span class="n">tmp_dir</span><span class="p">)</span>

        <span class="n">devkit_root</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">tmp_dir</span><span class="p">,</span> <span class="s2">&quot;ILSVRC2012_devkit_t12&quot;</span><span class="p">)</span>
        <span class="n">idx_to_wnid</span><span class="p">,</span> <span class="n">wnid_to_classes</span> <span class="o">=</span> <span class="n">parse_meta_mat</span><span class="p">(</span><span class="n">devkit_root</span><span class="p">)</span>
        <span class="n">val_idcs</span> <span class="o">=</span> <span class="n">parse_val_groundtruth_txt</span><span class="p">(</span><span class="n">devkit_root</span><span class="p">)</span>
        <span class="n">val_wnids</span> <span class="o">=</span> <span class="p">[</span><span class="n">idx_to_wnid</span><span class="p">[</span><span class="n">idx</span><span class="p">]</span> <span class="k">for</span> <span class="n">idx</span> <span class="ow">in</span> <span class="n">val_idcs</span><span class="p">]</span>

        <span class="n">torch</span><span class="o">.</span><span class="n">save</span><span class="p">((</span><span class="n">wnid_to_classes</span><span class="p">,</span> <span class="n">val_wnids</span><span class="p">),</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">META_FILE</span><span class="p">))</span>


<span class="k">def</span> <span class="nf">parse_train_archive</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">file</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">folder</span><span class="o">=</span><span class="s2">&quot;train&quot;</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Parse the train images archive of the ImageNet2012 classification dataset and</span>
<span class="sd">    prepare it for usage with the ImageNet dataset.</span>

<span class="sd">    Args:</span>
<span class="sd">        root (str): Root directory containing the train images archive</span>
<span class="sd">        file (str, optional): Name of train images archive. Defaults to</span>
<span class="sd">            &#39;ILSVRC2012_img_train.tar&#39;</span>
<span class="sd">        folder (str, optional): Optional name for train images folder. Defaults to</span>
<span class="sd">            &#39;train&#39;</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="n">archive_meta</span> <span class="o">=</span> <span class="n">ARCHIVE_META</span><span class="p">[</span><span class="s2">&quot;train&quot;</span><span class="p">]</span>
    <span class="k">if</span> <span class="n">file</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
        <span class="n">file</span> <span class="o">=</span> <span class="n">archive_meta</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
    <span class="n">md5</span> <span class="o">=</span> <span class="n">archive_meta</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>

    <span class="n">_verify_archive</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">file</span><span class="p">,</span> <span class="n">md5</span><span class="p">)</span>

    <span class="n">train_root</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">folder</span><span class="p">)</span>
    <span class="n">extract_archive</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">file</span><span class="p">),</span> <span class="n">train_root</span><span class="p">)</span>

    <span class="n">archives</span> <span class="o">=</span> <span class="p">[</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">train_root</span><span class="p">,</span> <span class="n">archive</span><span class="p">)</span> <span class="k">for</span> <span class="n">archive</span> <span class="ow">in</span> <span class="n">os</span><span class="o">.</span><span class="n">listdir</span><span class="p">(</span><span class="n">train_root</span><span class="p">)]</span>
    <span class="k">for</span> <span class="n">archive</span> <span class="ow">in</span> <span class="n">archives</span><span class="p">:</span>
        <span class="n">extract_archive</span><span class="p">(</span><span class="n">archive</span><span class="p">,</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">splitext</span><span class="p">(</span><span class="n">archive</span><span class="p">)[</span><span class="mi">0</span><span class="p">],</span> <span class="n">remove_finished</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>


<span class="k">def</span> <span class="nf">parse_val_archive</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">file</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">wnids</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">folder</span><span class="o">=</span><span class="s2">&quot;val&quot;</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Parse the validation images archive of the ImageNet2012 classification dataset</span>
<span class="sd">    and prepare it for usage with the ImageNet dataset.</span>

<span class="sd">    Args:</span>
<span class="sd">        root (str): Root directory containing the validation images archive</span>
<span class="sd">        file (str, optional): Name of validation images archive. Defaults to</span>
<span class="sd">            &#39;ILSVRC2012_img_val.tar&#39;</span>
<span class="sd">        wnids (list, optional): List of WordNet IDs of the validation images. If None</span>
<span class="sd">            is given, the IDs are loaded from the meta file in the root directory</span>
<span class="sd">        folder (str, optional): Optional name for validation images folder. Defaults to</span>
<span class="sd">            &#39;val&#39;</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="n">archive_meta</span> <span class="o">=</span> <span class="n">ARCHIVE_META</span><span class="p">[</span><span class="s2">&quot;val&quot;</span><span class="p">]</span>
    <span class="k">if</span> <span class="n">file</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
        <span class="n">file</span> <span class="o">=</span> <span class="n">archive_meta</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
    <span class="n">md5</span> <span class="o">=</span> <span class="n">archive_meta</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
    <span class="k">if</span> <span class="n">wnids</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
        <span class="n">wnids</span> <span class="o">=</span> <span class="n">load_meta_file</span><span class="p">(</span><span class="n">root</span><span class="p">)[</span><span class="mi">1</span><span class="p">]</span>

    <span class="n">_verify_archive</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">file</span><span class="p">,</span> <span class="n">md5</span><span class="p">)</span>

    <span class="n">val_root</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">folder</span><span class="p">)</span>
    <span class="n">extract_archive</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">file</span><span class="p">),</span> <span class="n">val_root</span><span class="p">)</span>

    <span class="n">images</span> <span class="o">=</span> <span class="nb">sorted</span><span class="p">([</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">val_root</span><span class="p">,</span> <span class="n">image</span><span class="p">)</span> <span class="k">for</span> <span class="n">image</span> <span class="ow">in</span> <span class="n">os</span><span class="o">.</span><span class="n">listdir</span><span class="p">(</span><span class="n">val_root</span><span class="p">)])</span>

    <span class="k">for</span> <span class="n">wnid</span> <span class="ow">in</span> <span class="nb">set</span><span class="p">(</span><span class="n">wnids</span><span class="p">):</span>
        <span class="n">os</span><span class="o">.</span><span class="n">mkdir</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">val_root</span><span class="p">,</span> <span class="n">wnid</span><span class="p">))</span>

    <span class="k">for</span> <span class="n">wnid</span><span class="p">,</span> <span class="n">img_file</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">wnids</span><span class="p">,</span> <span class="n">images</span><span class="p">):</span>
        <span class="n">shutil</span><span class="o">.</span><span class="n">move</span><span class="p">(</span><span class="n">img_file</span><span class="p">,</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">val_root</span><span class="p">,</span> <span class="n">wnid</span><span class="p">,</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">basename</span><span class="p">(</span><span class="n">img_file</span><span class="p">)))</span>
</pre></div>

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